Enhancement: Add Test

[localheinz]

This PR

• adds Test

[codecov]

Codecov Report

Merging #1 into master will not change coverage by %.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master        #1   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity         3        15   +12     
===========================================
  Files              1         3    +2     
  Lines              6        37   +31     
===========================================
+ Hits               6        37   +31     

Impacted Files	Coverage Δ	Complexity Δ
src/Exception/NotBackedUp.php	100.00% <0.00%> (ø)	1.00% <0.00%> (?%)
src/Exception/Invalid.php	100.00% <0.00%> (ø)	2.00% <0.00%> (?%)
src/Test.php	100.00% <0.00%> (ø)	12.00% <0.00%> (?%)

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